Fix a runtime warning after a change for bug #583773

Missed a case when an EMailReader is an EMailBrowser, which is not
an EMailView, which produced a runtime warning on a console when
a message was shown in a separate window (like after double-clicking it).

1 files changed, 1 insertions, 0 deletions

diff --git a/mail/e-mail-reader.c b/mail/e-mail-reader.c
index ba739703b3..0021294eb8 100644
--- a/mail/e-mail-reader.c
+++ b/mail/e-mail-reader.c
@@ -2642,6 +2642,7 @@ mail_reader_load_status_changed_cb (EMailReader *reader,
 
 	priv = E_MAIL_READER_GET_PRIVATE (reader);
 	if (priv->schedule_mark_seen &&
+	    E_IS_MAIL_VIEW (reader) &&
 	    e_mail_display_get_part_list (display) &&
 	    e_mail_view_get_preview_visible (E_MAIL_VIEW (reader)))
 		schedule_timeout_mark_seen (reader);